Keep in mind that your helm, steering equipment, and ladder are all on the starboard side. That stuff weighs more than the couch on port
That being said, watch it for a bit, if it gets worse have it pulled and checked right away. A lot of toons also have a fitting to put in the compressed air to test for leaks.
If it stays constant then when you pull it for the season ask to leave it on the lift for the evening and inspected to see if you see any damage or leaking.